Sub-megahertz linewidth 780.24  nm distributed feedback laser for<sup>87</sup>Rb applications

Gaetano, Eugenio Di; Watson, Scott; McBrearty, Euan; Sorel, Marc; Paul, Douglas J.

doi:10.1364/ol.394185

Cited by 23 publications

(8 citation statements)

References 26 publications

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“…The devices at both wavelengths follow similar designs to optimise their performance for these applications, although there are some key differences between the different materials. A detailed description of the fabrication processes can be found in [5] for the GaAs DFBs and in [6] for the GaN DFBs. The Schawlow-Townes formula allows us to see how the design parameters will ultimately affect the laser linewidth [7].…”

Section: Design and Fabricationmentioning

confidence: 99%

Distributed Feedback Lasers for Quantum Cooling Applications

Watson

Gwyn

Gaetano

et al. 2020

2020 22nd International Conference on Transparent Optical Networks (ICTON)

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There is an ever-growing need for compact sources which can be used for the cooling process in high accuracy atomic clocks. Current systems make use of large, expensive lasers which are power-hungry and often require frequency doubling in order to hit the required wavelengths. Distributed feedback (DFB) lasers have been fabricated at a number of key wavelengths which would allow chip scale atomic devices with very high accuracy to become a reality. Two key atomic transitions analysed here are 88Sr+ and 87Rb which require cooling at 422 nm and 780.24 nm, respectively. The vital parameter of the DFB lasers for this application is the linewidth, as very narrow linewidths are required in order for the atomic cooling process to occur. The lasers realised here produce the required power levels, with high side-mode suppression ratios and show good single mode tuning which is important for hitting precise wavelengths. This work will present the latest techniques and results using the DFB lasers at both wavelengths.

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Section: Design and Fabricationmentioning

confidence: 99%

Distributed Feedback Lasers for Quantum Cooling Applications

Watson

Gwyn

Gaetano

et al. 2020

2020 22nd International Conference on Transparent Optical Networks (ICTON)

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“…If a larger mode-hop free tuning range is required a DFB laser, where the current flows through the grating, is preferred. 4,5 In this manuscript, we present our results of 780 nm region fabricated DFB laser diodes. Required gratings were implemented within the structure, involving an overgrowth step in epitaxial processes.…”

Section: Introductionmentioning

confidence: 99%

Optimization and fabrication of 780 nm DFB lasers for quantum systems

Ulkuniemi

Kuusela²,

Aho³

et al. 2023

Quantum Computing, Communication, and Simulation III

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Laser diode solutions for quantum systems have highly variable requirements, depending on the technology and purpose of the laser used in the applicationfor instance, quantum control of particles or molecules and excitation of the quantum systems. Requirements of the laser systems used in the mentioned applications are highly demanding, such as single-mode operation, frequency stability over operation lifetime and narrow spectral linewidth. Narrow spectral linewidth can be achieved with distributed Bragg reflector (DBR), distributed feedback (DFB) lasers and external cavities. Wavelength of laser diode and light output power can vary depending on the intended application. For further efficiency, such emitters can be fabricated in arrays, eliminating the need for multiple single-emitter chips. Individually addressability of the emitters further enhances the efficiency. Examples of different applications using laser diodes described earlier are frequency comb generation, single-photon emitters, and timing sources for picosecond pulses.In this work, we present our results in 780 nm region DFB laser diodes. Gratings were implemented within the structure, including overgrowth step. Multiple variants in grating pitch were introduced for structure and design optimization purposes. Future improvements in the device processing, design, and reliability are discussed. 780 nm region laser diodes are used in multiple quantum systems, such as atomic clocks and manipulation of Rb atoms. In addition, it can be used for terahertz wave generation.

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“…Quantum cold atom sensors use magneto-optical traps (MOTs) [10][11][12] comprising laser-cooling sub-systems of: lasers, magnetic coils, optics, and ultra-high vacuum. Development of compact laser systems is a subject of on-going research, using diode laser and telecommunications industry technology for robust miniaturisation [13][14][15][16][17]. Magnetic coils optimised for low power consumption can be designed and fabricated [18], and the optics for laser cooling can be simplified to a single beam illuminating a pyramidal or planar optic [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Stand-alone vacuum cell for compact ultracold quantum technologies

Burrow,

Osborn,

Boughton

et al. 2021

Preprint

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Compact ultra-high vacuum systems are key enabling components for cold atom technologies, facilitating extremely accurate sensing applications. There has been important progress towards a truly portable compact vacuum system, however size, weight and power consumption can be prohibitively large, optical access may be limited, and active pumping is often required. Here, we present a centilitre-scale ceramic vacuum chamber with He-impermeable viewports and an integrated diffractive optic, enabling robust laser cooling with light from a single polarization-maintaining fibre. A cold atom demonstrator based on the vacuum cell delivers 10 7 laser-cooled 87 Rb atoms per second, using minimal electrical power. With continuous Rb gas emission active pumping yields a 10 −7 mbar equilibrium pressure, and passive pumping stabilises to 3 × 10 −6 mbar, with a 17 day time constant. A passively-pumped vacuum cell, with no Rb dispensing, has currently kept a similar pressure for a year. The passive-pumping vacuum lifetime is several years, estimated from shortterm He throughput, with many foreseeable improvements. This technology enables wide-ranging mobilization of ultracold quantum metrology.

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Sub-megahertz linewidth 780.24 nm distributed feedback laser for⁸⁷Rb applications

Cited by 23 publications

References 26 publications

Distributed Feedback Lasers for Quantum Cooling Applications

Distributed Feedback Lasers for Quantum Cooling Applications

Optimization and fabrication of 780 nm DFB lasers for quantum systems

Stand-alone vacuum cell for compact ultracold quantum technologies

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Sub-megahertz linewidth 780.24 nm distributed feedback laser for87Rb applications

Cited by 23 publications

References 26 publications

Distributed Feedback Lasers for Quantum Cooling Applications

Distributed Feedback Lasers for Quantum Cooling Applications

Optimization and fabrication of 780 nm DFB lasers for quantum systems

Stand-alone vacuum cell for compact ultracold quantum technologies

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Sub-megahertz linewidth 780.24 nm distributed feedback laser for⁸⁷Rb applications